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element.cc
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/**
* @file element.cc
* @author Alejandro M. Aragón <alejandro.aragon@epfl.ch>
* @date Mon Jan 23 09:00:00 2012
*
* @brief contact element classes
*
* @section LICENSE
*
* Copyright (©) 2010-2011 EPFL (Ecole Polytechnique Fédérale de Lausanne)
* Laboratory (LSMS - Laboratoire de Simulation en Mécanique des Solides)
*
* Akantu is free software: you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License as published by the Free
* Software Foundation, either version 3 of the License, or (at your option) any
* later version.
*
* Akantu is distributed in the hope that it will be useful, but WITHOUT ANY
* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
* A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
* details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with Akantu. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <boost/chrono.hpp>
#include "element.hh"
#include "aka_math.hh"
#include "aka_geometry.hh"
__BEGIN_AKANTU__
template <>
bool check_penetration<2>(UInt node, const Element* el, SolidMechanicsModel& model) {
typedef Point<2> point_type;
Mesh& mesh = model.getMesh();
const Vector<Real> &x = model.getCurrentPosition();
const Vector<UInt> &conn = mesh.getConnectivity(el->type);
point_type r(&x(node));
// NOTE: switch on a enumerated type is a sign of a bad
// object-oriented design
switch (el->type) {
case _segment_2:
{
// get element extreme points
point_type p(&x(conn(el->element,0)));
point_type q(&x(conn(el->element,1)));
return left_turn(p, q, r) > 0;
}
break;
default:
cout<<"*** ERROR *** Function signed measure in file "<<__FILE__<<", line "<<__LINE__;
cout<<", is not implemented for element of type "<<el->type<<endl;
cout<<"*** ABORTING *** "<<endl;
exit(1);
break;
}
}
template <>
bool check_penetration<3>(UInt node, const Element* el, SolidMechanicsModel& model) {
typedef Point<3> point_type;
Mesh& mesh = model.getMesh();
const Vector<Real> &x = model.getCurrentPosition();
const Vector<UInt> &conn = mesh.getConnectivity(el->type);
point_type r(&x(node));
// NOTE: switch on a enumerated type is a sign of a bad
// object-oriented design
switch (el->type) {
case _triangle_3:
{
// get element extreme points
point_type o(&x(conn(el->element,0)));
point_type p(&x(conn(el->element,1)));
point_type q(&x(conn(el->element,2)));
// get signed volume
point_type po = o - p;
point_type pq = q - p;
point_type pr = r - p;
// cross product
point_type c = cross(pq, po);
Real v = pr*c;
return v < 0;
}
break;
default:
cout<<"*** ERROR *** Function signed measure in file "<<__FILE__<<", line "<<__LINE__;
cout<<", is not implemented for element of type "<<el->type<<endl;
cout<<"*** ABORTING *** "<<endl;
exit(1);
break;
}
}
template <>
Point<2> minimize_distance<2>(UInt node, const Element* el, SolidMechanicsModel& model) {
const UInt d = 2;
typedef Point<d> point_type;
const Vector<Real> &x = model.getCurrentPosition();
point_type r(&x(node));
// NOTE: switch on a enumerated type is a sign of a bad
// object-oriented design
switch (el->type) {
case _segment_2:
{
Distance_minimzer<_segment_2> data(&x(node), el, model);
return data.point();
}
break;
default:
cout<<"*** ERROR *** Function signed measure in file "<<__FILE__<<", line "<<__LINE__;
cout<<", is not implemented for element of type "<<el->type<<endl;
cout<<"*** ABORTING *** "<<endl;
exit(1);
break;
}
assert(false);
return point_type(); // avoid compiler warning: control reaches end of non-void function
}
template <>
Point<3> minimize_distance<3>(UInt node, const Element* el, SolidMechanicsModel& model) {
typedef boost::chrono::high_resolution_clock clock_type;
typedef typename clock_type::time_point time_type;
const UInt d = 3;
typedef Point<d> point_type;
const Vector<Real> &x = model.getCurrentPosition();
point_type r(&x(node));
// NOTE: switch on a enumerated type is a sign of a bad
// object-oriented design
switch (el->type) {
case _triangle_3:
{
Distance_minimzer<_triangle_3> data(&x(node), el, model);
time_type start = clock_type::now();
data.optimize();
boost::chrono::nanoseconds ns = clock_type::now() - start;
cout<<data.iterations()<<"\t"<<ns.count()<<endl;
// cout<<data.point()<<endl;
return data.point();
// const UInt nb_nodes = 3;
//
// // get triangle coordinates from element and point coordinates
// Mesh& mesh = model.getMesh();
// std::vector<point_type> pts(nb_nodes);
//
// const Vector<UInt> &conn = mesh.getConnectivity(el->type);
// for (UInt i=0; i<nb_nodes; ++i)
// for (UInt j=0; j<d; ++j)
// pts.at(i)[j] = x(conn(el->element,i),j);
//
// // get closest point
// time_type start = clock_type::now();
//
// Point<3> q = naive_closest_point_to_triangle(r,pts[0],pts[1],pts[2]);
//
// boost::chrono::nanoseconds ns = clock_type::now() - start;
// cout<<ns.count()<<endl;
//
//// static unsigned int k = 0;
//// if (sqrt((q - data.point()).sq_norm()) > 1e-2) {
//// cout<<++k<<endl;
//// cout<<"difference"<<endl;
//// cout<<data.point()<<endl;
//// cout<<q<<endl;
//// cout<<" iter -> "<<data.iterations()<<endl;
//// }
//
//
// return q;
// const UInt nb_nodes = 3;
//
// // get triangle coordinates from element and point coordinates
// Mesh& mesh = model.getMesh();
// std::vector<point_type> pts(nb_nodes);
//
// const Vector<UInt> &conn = mesh.getConnectivity(el->type);
// for (UInt i=0; i<nb_nodes; ++i)
// for (UInt j=0; j<d; ++j)
// pts.at(i)[j] = x(conn(el->element,i),j);
//
// // get closest point
// time_type start2 = clock_type::now();
//
// Point<3> q = closest_point_to_triangle(r,pts[0],pts[1],pts[2]);
//
// boost::chrono::nanoseconds ns2 = clock_type::now() - start2;
// cout<<ns2.count()<<endl;
// cout<<q<<endl;
//
// static unsigned int k = 0;
// Real diff = sqrt((q - data.point()).sq_norm());
// if (diff > 1e-8) {
// cout<<"diff -> "<<diff<<endl;
// cout<<++k<<endl;
// cout<<data.point()<<endl;
// cout<<q<<endl;
// cout<<" iter -> "<<data.iterations()<<endl;
// }
//
//
// return q;
}
break;
case _triangle_6:
{
Distance_minimzer<_triangle_6> data(&x(node), el, model);
time_type start = clock_type::now();
data.optimize();
boost::chrono::nanoseconds ns = clock_type::now() - start;
cout<<data.iterations()<<"\t"<<ns.count()<<endl;
return data.point();
}
break;
default:
cout<<"*** ERROR *** Function signed measure in file "<<__FILE__<<", line "<<__LINE__;
cout<<", is not implemented for element of type "<<el->type<<endl;
cout<<"*** ABORTING *** "<<endl;
exit(1);
break;
}
assert(false);
return point_type(); // avoid compiler warning: control reaches end of non-void function
}
__END_AKANTU__

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